Once fully charged how long will it hold a charge before i use it. i plan on using it at the lowest setting. how long will it stay warm once i use it?

It can last for over 72hrs. Also depends on how long you stay outside.

Is it possible just to use/charge/store each half of the hand warmer independently? Or is there only one charging input and on/off for the paired set?

Each piece is identical. You can use/charge/store them independently. They each have their own port and their own power button.

Can this charge a phone too?

These are not battery packs, they’re single purpose devices. They charge with a USB to USB-C split cable. If your phone charged with a USB-C male cable, then you could use the cable to charge your phone, but you cannot draw power from the hand warmers.

Brand	Dnaleao
Color	Black
Recommended Uses For Product	Outdoor
Battery Description	Lithium-Ion
Battery Capacity	4000 Milliamp Hours
Charging Time	4 Hours
Lower Temperature Rating	95 Degrees Fahrenheit
Reusability	Rechargeable
Upper Temperature Rating	131 Degrees Fahrenheit
Manufacturer	Guangdong Aoyun Technology Co., Ltd.
UPC	727238960066
Item Package Dimensions L x W x H	5.16 x 3.74 x 0.94 inches
Package Weight	0.17 Kilograms
Brand Name	Dnaleao
Suggested Users	Rechargeable Hand Warmers
Part Number	AO-212

Dnaleao

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